BMW K bikes (Bricks)


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Wirelic

Wirelic
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Hi All,

Have a 1985 K100.  At higher RPMs, say 5000 or so, if I snap the throttle closed the engine dies.  Once it drops under 2000 RPM, popping the clutch will get it to fire.  Could this be the idle or throttle switch?  Ideas?  Thank you.

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Rick G

Rick G
admin
admin
Check the exhaust valve clearance this can happen if they are tight.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

92KK 84WW Olaf

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Tight exchaust valve clearances will do that.

But also the TPS Throttle Position Sensor switch on the throttle bodies beside the coil cover cuts the fuel supply when you close the throttle, until the revs have dropped back to 2,000 rpm. You might need to check this is set correctly. You can disconnect it and it will [should] still run. I currently have it disconnected on my 83 RS.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Other things to check: Throttle body air screws and balance.  They should be set approximately 1 1/2 to 2 turns from lightly bottomed.

Z tube and throttle body air caps for cracks.

Air filter.

Something seems to be messing up the mixture when you close the throttle.  How is the idle when the engine is cold?


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

5Back to top Go down   K100 Dies after snapping throttle closed at 5000+ RPM, why Empty K100 dies Fri Mar 08, 2024 11:21 am

Wirelic

Wirelic
active member
active member
Thank you for your suggestions.  I’ll let you know the outcome & solution.

https://http:www.stendermotorcycleservice.com
    

Wirelic

Wirelic
active member
active member
Point-Seven-five wrote:Other things to check: Throttle body air screws and balance.  They should be set approximately 1 1/2 to 2 turns from lightly bottomed.

Z tube and throttle body air caps for cracks.

Air filter.

Something seems to be messing up the mixture when you close the throttle.  How is the idle when the engine is cold?
Idle is fine.  I’ll check your suggestions.  Thank you

https://http:www.stendermotorcycleservice.com
    

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